import { z } from 'zod'

/** Which form on the page produced the lead. Surfaces as an amoCRM tag. */
export const leadFormIds = ['request'] as const
export type LeadFormId = (typeof leadFormIds)[number]

export const utmKeys = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_content', 'utm_term'] as const

const optionalText = (max: number) =>
  z
    .string()
    .trim()
    .max(max)
    .optional()
    .transform((v) => (v ? v : undefined))

export const leadSchema = z.object({
  form: z.enum(leadFormIds),
  name: z.string().trim().min(1, 'Укажите имя').max(200),
  phone: z.string().trim().min(5, 'Укажите телефон').max(50),
  email: z
    .union([z.email().max(200), z.literal('')])
    .optional()
    .transform((v) => (v ? v : undefined)),
  /** Hotel or hotel chain the request comes from. */
  company: optionalText(200),
  comment: optionalText(4000),
  page: optionalText(300),
  referrer: optionalText(500),
  // partialRecord, not record: z.record over an enum requires every key.
  utm: z.partialRecord(z.enum(utmKeys), z.string().max(300)).optional(),
  /** Honeypot. Bots fill it in; humans never see it. */
  website: z.string().max(200).optional(),
})

export type LeadPayload = z.infer<typeof leadSchema>
/** What the client sends — before zod's optional/empty-string normalisation. */
export type LeadInput = z.input<typeof leadSchema>

export type LeadResponse =
  | { ok: true; leadId: number; contactId: number }
  | { ok: false; error: string; fields?: Record<string, string> }